js生成和下载二维码

2022-04-17 23:38:22

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
<html> 
    <head> 
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
        <title>js_canvas_download</title> 
        <script type='text/javascript' src='http://cdn.staticfile.org/jquery/2.1.1/jquery.min.js'></script> 
        <script type="text/javascript" src="http://cdn.staticfile.org/jquery.qrcode/1.0/jquery.qrcode.min.js"></script> 
    </head> 
    <body> 
        <div id="qrcode"></div> 
        <a id="download" download="qrcode.jpg"></a> 
        <button id="save">save</button> 
    </body> 
</html> 
<script> 
    jQuery('#qrcode').qrcode({width: 500,height: 500,text: "http://www.baidu.com"}); 
     
    $("#save").click(function(){ 
        var canvas = $('#qrcode').find("canvas").get(0); 
        var url = canvas.toDataURL('image/jpeg'); 
        $("#download").attr('href', url).get(0).click(); 
        return false; 
    }); 
</script>

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